Cynomorium coccineum

Cynomorium is a genus of parasitic perennial flowering plants in the family Cynomoriaceae. The genus consists of only one species, Cynomorium coccineum (although one of its subspecies is sometimes treated as a separate species). Its placement in the Saxifragales was resolved in 2016 with the help of nuclear, plastid, and mitochondrial sequences obtained from next-generation sequencing . Common names include the misleading Maltese fungus or Maltese mushroom; also desert thumb, red thumb, tarthuth (Bedouin) and suoyang (Chinese). A rare or local species, it grows in dry, rocky or sandy soils, often in salt marshes or other saline habitats close to the coast. It has had a wide variety of uses in European, Arabian and Chinese herbal medicine. This plant has no chlorophyll and is unable to photosynthesise. It is a geophyte, spending most of its life underground, in the form of a rhizome, which is attached to the roots of its host plant; it is a holoparasite, i.e. totally dependent on its host. The low-growing inflorescence emerges (in spring, following winter rain), on a fleshy, unbranched stem (most of which is underground) with scale-like, membranous leaves. Dark-red or purplish, the inflorescence consists of a dense, erect, club-shaped mass, some 15–30 cm (5.9–11.8 in) long, of minute scarlet flowers, which may be male, female or hermaphrodite. It is pollinated by flies, attracted to the plant by its sweet, slightly cabbage-like odour. Once pollinated, the spike turns black. The fruit is a small, indehiscent nut. In the Mediterranean region, Cynomorium is a parasite of salt-tolerant plants in the Cistaceae (cistus family) or Amaranthaceae (amaranth family); elsewhere it parasitizes Amaranthaceae, Tamaricaceae (tamarisks) and, in China, Nitrariaceae, especially Nitraria sibirica. Other authorities suggest the host plants are saltbushes (Atriplex species, Amaranthaceae). DNA studies suggest that Cynomorium is not a member of the Balanophoraceae, as previously thought, but more probably belongs to the Saxifragales, possibly near Crassulaceae (stonecrop family). The issue is complicated by the massive horizontal gene transfer between Cynomorium and its different hosts. Cynomorium coccineum var. coccineum is found in Mediterranean regions, from Lanzarote in the Canary Islands and Mauritania through Tunisia and Bahrain in the south; Spain, Portugal, southern Italy, Sardinia, Sicily, Gozo, Malta and the Eastern Mediterranean. Its range extends as far east as Afghanistan, Saudi Arabia and Iran. Cynomorium coccineum var. songaricum is found in Central Asia and Mongolia, where it grows at high altitudes. Several authorities consider this to be a separate species, C. songaricum; it is called 'suoyang' (Chinese: 鎖陽) in China, where it is extensively collected as a herbal remedy for illnesses including sexual worries and nocturnal emissions. Sir David Attenborough has suggested that, following the reasoning of the 'Doctrine of signatures', the phallic shape of the inflorescence suggested to early herbalists that Cynomorium should be used as a cure for erectile dysfunction and other sexual problems. Its colour suggested that it would cure anaemia and other diseases of the blood. It has been used for similar purposes in the east and west of its range: crusaders carried dried spikes to help them recover from their wounds. Other traditional uses have included treatments for apoplexy, dysentery, sexually transmitted diseases, hypertension, vomiting and irregular menstruation.